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1.
A person who goes from thread to thread on a message board oblivious to other posters, addressing every post you write and rehashing old gripes based on a personal issue they have with you.
John: I am glad someone created a topic about rude drivers. I hate it when people cut me off on the freeway!

Jane: Oh there you go again John! Just like I told you before, you never have kind words for anyone. I noticed you have a problem with people ever since your thread about your sassy, freeloading cousin. You need to get therapy if you can't handle rude drivers and family members, etc. etc.....

John: Jane, you go into every thread I am in and derail it with your personal issue with me. You're nothing but a thread stalker! There's other posters on this message board, you know.
by Lemonade Squeeze September 30, 2012
 
2.
Someone who follows another from thread to thread...usually with the intent to harm them by defaming their character, putting them down, continuing an on-going argument from a previous thread of several years past...etc.
hey, remember me...remember that time you said I didn't know what I was talking about? Yeah, you...you started it you Threadstalker ....you dissed me last month....so I am going to follow you and make your life miserable tell the end of your days. Or at least as long as it takes you to get a different on-line user name...And then I'll still recognize your sorry ass...and hound it.....
by justbegintowrite December 29, 2008